Wanted BMC Engine to VW G/B Adapter Plate

I am building an MG special and need an adapter plate and associated fittings to suit a BMC B Series motor to a Volkswagen gearbox.There must be a lot of these floating around from the sixties as there were a lot of rear engined BMC powered racing / sports cars.A lot of them were bolted to early Hewland boxes which I think were basically a VW casing with Hewland uprated internals.
Information on units in Australia would be good, but will extend search world wide if necessary.